Type wheel adjusting mechanism



1951 K. AURBACH TYPE WHEEL ADJUSTING MECHANISM I 2 SHEETS-SHEET 1 FiledAug. 16, 1949 Jnventor:

Dec. 25,1951 K. AURBA-CH 2,579,535

TYPE WHEEL ADJUSTING MECHANISM Filed Aug. 16, 1949 2 SHEETS-SHEET 2Patented Dec. 25, 1951 TYPE WHEEL ADJUSTING MECHANISM Kurt Aurbach,Bielefeld, Germany, assignor to Anker-Werke, A. G., Bielefeld, Germany,a corporation of Germany Application August 16, 1949, Serial No. 110,552

In Germany October 1, 1948 10 Claims. (01.101-110 I The inventionrelates to mechanisms for the transmission of motion, especially inbusiness machines such as cash registers, calculating machines orbookkeeping machines.

These and other objects and features of the invention will be apparentfrom the embodiment exemplified by the drawing and described in thefollowing.

Figure 1 shows an axial section throu h a mechanism according to theinvention applied. to

the printing device for a cash register or other business machine; andFigs. 2 to 7 show etai s In known machines of this kind, the type wheelsof the same mechanism, Fig. 6 being a partial or the type-Wheeladjusting members of a printbottom view of the part shown in Fig. '7.ing device are attached to hollow concentric The illustrated printingdevice. comprises a transmission shafts to permit mounting theprintnumber of coaxial spur gears I (Figs. 1, 2, 3) ing device, forinstance, at one side of the maarranged side by side at the driving endof. th chine. The hollow shafts are driven from the transmission andriveted or otherwise firmlyatadjusting or actuating mechanism of themachine tached to respective transmission tubes 2. ..'I'1'.1through'spur gears or gear sectors. tubes 2 surround one anotherconcentrically- The hollow shafts of such transmissions must They havedifferent, graduated lengths and are be machined on their full length toafford a radially spaced from one another. I satisfactory journaling.Due to the sometimes Each spur gear I has a circular groove 3.001.1-considerable length of the hollow shafts, apprecentric to the tubes 2.Each groove 3 is engaged ciable friction is encountered which mayinterby a corresponding circular projection formed by fere with thedesired ease of operation especially an indentation 4 (Figs. 1 and 4) ofa bearing disc in machines whose type wheels are directly ad- 5. Eachdisc 5 has projections 6, 1 with which justed by a mechanical connectionwith the it is mounted in a stationary holder 8 (Figs. manualitem-setting or control means as is the 1, 6, '7). The projection 6 ofeach disc 5 engages case in lever-type register mechanisms. a slot 9,and the two projections 1 engage respec- It is an object of theinvention to devise a tive slots Hi of holder 8. Additional projectionshollow-shaft transmission, especially for ma- II of each disc 5 limitits movement relative to chines of the above-mentioned kind, thatelimithe holder 8. Bosses [2, which project from both nates thenecessity of an extensive and accurate sides of each bearing disc .5,secure a proper machining of the transmission shafts and, if lateralspacingbetween the spur gears I. Acover desired, permits using simpledrawn tubes with plate I3 (Fig. 1) has openings with which-it is rawperipheral surfaces without detriment to the placed under tension overprojections l5 of desired accuracy of transmission. holder 8. Holder 8is firmly secured by screws I6 Another object of the invention is toprovide a to a supporting frame I! which is part of the hollow-shafttransmission which eliminates the frame or wall of the business machineor, preferabove-mentioned detrimental friction regardless ably, is aseparate structure to be fastened to the of the length or number ,ofconcentric transmismain frame or wall of the machine. sion shafts. Eachtube 2 has noses I8 (Fig. 3) engageable In order to achieve theseobjects and in accordwith matching grooves I9 (Fig. 5) of a ring. 20ance with one of the features of the invention, a which has a radialprojection or driver M in transmission mechanism, in particular foradengagement with an opening. 22 of an annular justing the type wheelsof a cash register or type carrier 23 (Figs. 1 and 5) andis stepped atother business machine, has a plurality of con- 24 (Fig. 1). Each of agroup of type carriers 23 centric transmission tubes radially spacedfrom is journaled on a guide ring 25 whose guide porone another; andeach transmission unit-comtion 26 extends over only part of the.periphery. prising a transmission tube and two gear or wheel Theremaining part of the periphery is cut out members at the respectiveends of the tube-is so that the driver 21 can move angularly withjournaled in bearing means that engage the gear respect to ring25. inorder. to entrain and adjust orwheel members rather than the tube. thetype carrier 23. All. guide rings 25 are stacked According to anotherfeature of the invention, onto bolts 21 which are screwed intothesupport a type wheel member is secured to one end of IT. A cover pl e 29fastened ts N holds each tube and a spur gear member is firmly theannular type carriers 23 inposition. 1 secured to the other end toimpart the type select- When the illustrated mechanism is inserted-ining motion through the tube to the wheel mema business machine, the sp rgears I are in bar; and each of the wheel and gear members meshingengagement with gears, sectors or racks has a circular or arcuateguiding face concenwhich are actuated or controlled by the amounttric tothe tube and engaged by stationarily setting device or keys (not shown)of the mamounted bearing means. 7 chine. Of course, a second system ofconcentric tubes may be provided to couple the spur gears I with theamount-setting means of the machine, for instance, to permitmountingthe'printing mechanism at one side of the machines The It isapparent from the above-described embodiment that the transmission tubes2 are relieved from all journaling duty and hence do not requiremachining along most or all of their length. As a matter of'fact, drawntubes with non-machined surfaces are readily applicable. It will'furtherbe recognized that the bearing friction of the transmission is reducedto a minimum and substantially independent of the length of the tubes.skilled in the art that, as regards design details, the inventionpermits various modifications, and may be embodied in designs other thanthe one specifically illustrated and described, without departing fromthe objects and principles of the invention and within the essentialfeatures set forth in the claims annexed hereto.

' I claim:

1. A type adjusting mechanism for a printing device, comprising aplurality of rotary and coaxial type carrier members, a plurality ofcoaxial drive gear members axially spaced from said type carriermembers, a plurality of concentric transmission tubes connecting saidtype carrier members with said respective gear members, and bearingmeans spaced from said tubes and in journaling engagement with saidrespective members.

2. A type adjusting mechanism for the printing device of a businessmachine, comprising a plurality of annular type carriers coaxial andadjacent to one another, a corresponding plurality of spur gears forindividually rotating said carriers, said gears being coaxial andadjacent to one another and axially spaced from said carriers, acorrespondingly plurality of concentric tubes radially spaced from oneanother, each of said tubes connecting one of said respective gears withone of said respective carriers, and separate bearing means inindividual journaling engagement with each of said carriers and each ofsaid gears.

v3. A mechanism for transmitting. rotary motion, comprising a pluralityof transmission units each having a transmission tube and having adriving member and a driven membersecured to said tube at the respectiveends thereof, said tubes of said units being concentric and radiallyspaced from one another, and bearing means coaxial to said tubes and injournaling engagement with said respective members.

4. A mechanism for transmitting rotary motion, comprising a plurality ofconcentric transmission tubes, a group of annular drive members eachattached to one end of one of said respective tubes, a group of annulardriven members spaced from said group of drive members, said drivenmembers being attached to the other ends of said respective tubes, eachof said driving and driven members having respective circular andcoaxial bearing faces of larger diameter than It will also be obvious tothose said respective tubes, and stationary bearing I 5. In a mechanismaccording to claim 4, the

combination, a stationary holder extending across said discs and beingengaged thereby to maintain a fixed axial spacing between said discs,and said discs having projections directed toward the adjacent membersfor maintaining a substantially fixed axial spacing between saidmembers.

7. A type adjusting mechanism tor a printing device, comprising a groupof annular spur gears coaxial and adjacent to one another, bearing meansdisposed intermediate said gears and in journaling engagement with saidindividual gears, a group of concentric transmission tubes each havingone end attached to one of said respective gears, a group of drive ringsconnected to the other ends of said respective tubes, a group of typecarriers surrounding said respective rings and being radially spacedtherefrom to form a circular gap therewith, bearing means extendingthrough said gaps for journaling said rings and carriers, each of saidrings having a drive means connecting said ring with the oneappertaining carrier across said gap.

8. In a mechanism according to claim 7, said drive rings and saidrespective tubes having mutually engageable nose-and-groove means, andsaid drive rings being connected with said respective tubes merely bybeing seated thereon so that said respective nose-and-groove means arein engagement with each other.

9. A type adjusting mechanism for a printing device, comprising asupporting frame for attachment to a business machine, a plurality ofannular spur gears, bearing means attached to said frame and injournaling engagement with said gears, a plurality of annular typecarrier members axially spaced from said gears, bearing means attachedto said frame and in journaling engagement with said members, and aplurality of concentric transmission tubes connecting said gears withsaid respective members and being supported only by said gears andmembers.

10. A type adjusting mechanism for a printing device, comprising a groupof annular spur gears coaxial and adjacent to one another,.said gearshaving the same outer diameters and progressively difierent innerdiameters respectively and having respective bearing grooves ofequaldiameters, a group ofguide discs disposed adjacent to said respectivegears and having each a circular projection engaging said groove of anadjacent gear, a group ofconcentric transmission tubes of which theinner ones are longer than the outer ones, said tubes having one endconnected with said respective gears, and a group of annular typecarrier'members having progressively different inner diameters and beingconnected with the other ends of said respective tubes, said membershaving equal outer diameters respectively and having respective arcuateslots of equal diameters, and means traversing said slots for journalingsaid members. V

' KURT AURBACH.

No references cited.

